I have hunted for threads on this but can not find them. I have looked at Pela/Moeller and cant decide any suggestion would helpful. I will be using it for oil change, trany change, and v drive change.

I have the Pela one. It works great. Will work with any fluid you want to change. the part you stick into the dipstick hole is plastic coated metal - this is important. A flexible hose will collapse under the vacuum when sucking up hot/warm fluid. And the plastic coated metal is easier to fish down the dipstick. Mine has a subtle obstruction (meaning it hits something on the way to the bottom of the pan). but I am able to bounce off it a few times and get past it to get to the bottom of the oil pan. The other nice thing is that it is very easy to transfer the used oil into another container for recycling. It keeps the whole process cleaner than usual IMO. No I dont work for Pela ;-) Hope this helps

Ok, dumb question. Do all of you not have the quick drain hose connected to the bottom of the oil pan? I just pull the quick drain hose through the plug opening in the bottom of the boat and drain the oil. Perhaps all boats don't have this feature? The inboards I have owned all had this (all had Indmar engines).

I've got one similar to the one that Peter_C linked. 6 litre tank, automatic siphon. Good for oil, fuel and coolant if you have closed cooling. You could probably use it to bleed brakes by yourself as well.

If you run your boat to warm up the oil AND pull the oil dipstick up about 1 inch to allow air into the engine, it will take about 60 seconds to drain all the oil out of the engine. I have changed my oil on all my boats this way for the last 10 years. If you do it with a cold engine it will take much longer. Also, if you don't pull up the dipstick, it will take longer.